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M17-15

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Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42269

Kudos [?]: 132827 [0], given: 12378

M17-15 [#permalink]

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New post 16 Sep 2014, 01:01
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

95% (00:21) correct 5% (00:16) wrong based on 174 sessions

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Kudos [?]: 132827 [0], given: 12378

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42269

Kudos [?]: 132827 [0], given: 12378

Re M17-15 [#permalink]

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New post 16 Sep 2014, 01:01

Kudos [?]: 132827 [0], given: 12378

Intern
Intern
avatar
B
Joined: 16 Jul 2017
Posts: 34

Kudos [?]: 3 [0], given: 9

CAT Tests
Re: M17-15 [#permalink]

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New post 07 Nov 2017, 12:19
Break 42 * 36 down into prime numbers --> 42 * 36 = (7)(3)(2) * (3)(3)(2)(2) or (7^1)(3^3)(2^3)
Now we need to check the answers to see if there are any prime factorisations that don't match up with the above.

A. 12 = (3)(2)(2) -- this is OK
B. 18 = (3)(3)(2) -- this is OK
C. 21 = (7)(3) -- this is OK
D. 28 = (7)(2)(2) -- this is OK
E. 49 = (7)(7) -- not OK! The original prime factorisation only has one 7, therefore this is NOT a divisor!

Kudos [?]: 3 [0], given: 9

Re: M17-15   [#permalink] 07 Nov 2017, 12:19
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M17-15

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